Indeed, he needs a CC added to each skill. Humble suggestions for a baseline to be buffed softly later:
Mace of Spades: All targets hit are stunned for 1 second
Shieldery Thing: Buffed target gets 50% reduction in CC for duration
Cone of Pwn: All targets receive a DoT that does 30% of the initial damage over 4 seconds.
Children of Huehue: Ghost maximum duration removed. It's so dumb when I see a ghost die at full health. The other team should have to respond to the threat of my ghost, ok? Also, targets of the ult are slowed 50% for duration, even an ulted Yi because **** Yi